JPS6231304Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a support structure for a main gear shift lever in a tractor.

Conventionally, the main gear shift lever of a tractor is supported by the clutch housing and protrudes upward from the clutch housing.The support structure is complicated and the support strength is weak, so the main gear shift lever is not supported reliably, which hinders gear shifting operation. This was a cause for concern.

In this idea, a shifter guide is provided on the transmission case at the rear of the aircraft, a support member is provided protruding from the shifter guide in a substantially horizontal direction (toward the rear of the aircraft), and a transmission mechanism is installed between the support members. A support structure for a main shift lever in a tractor, in which a main shift lever that can be operated is supported by the support member, and the main shift lever is firmly supported by the support member, thereby simplifying the shift operation and the structure of the support part. We aim to provide the following.

To explain the embodiment of this invention in detail based on the drawings, a tractor A has an engine 1 mounted on the front part of the body, a radiator 2 in front of the engine 1, and an auxiliary water tank 3 connected to the radiator 2 in the rear. ,
A partition wall 4 is erected behind this auxiliary water supply tank 3, and a fuel tank 5 is provided behind the partition wall 4, and the whole is covered with a bonnet 6.

On the other hand, the power of the engine 1 is transmitted to the transmission case 8 in the rear part B of the fuselage via a main shaft (not shown) that is placed horizontally on the back side of the clutch housing 7 provided in the center of the fuselage.

A rear axle case 9 is provided integrally with the transmission case 8 at the rear part B of the fuselage, and a rear wheel 11 is attached to an axle 10 extending outward from the axle case 9 on both sides.
In addition, a power transmission shaft 12 is tilted toward the front of the aircraft body from a part of the transmission case 8, and the front wheels 13 are driven by this power transmission shaft 12.

On the other hand, a hydraulic case 14 is placed on the rear axle case 9, and one end of a seat bracket 15 is fixed to this hydraulic case 14 with a bolt 16.
The other end is placed on a shifter guide 18 provided on a transmission case 8, and is tightened and fixed together with bolts 19, and a seat 17 is mounted on this seat bracket 15.

The shifter guide 18 described above is bent into an inverted U shape, with the horizontal plate portion 18a facing upward, and the rising plate portions 18b and 18c at both ends are fastened to both side walls of the mission case 8 with bolts 20 and 21, respectively. The supporting members 23, 2 are attached and fixed in a substantially horizontal direction (toward the rear of the fuselage) from the rising plate portions 18b and 18c at both ends.
3' is provided protrudingly between the support members 23 and 23', and the main transmission shifter arm 30 and the main transmission lever 31 are connected using the support member 23 as a support.
extends in the direction of the fender 32.

That is, the sliding shaft 2 is formed to be slidable in the left and right direction.
4 is supported through the support members 23, 23',
The main speed shifter 22 is fixed to the sliding shaft 24, and the tip 22a of the main speed shifter 22 is inserted into the recess 26 at the base of the horizontally provided operating shaft 25, and this portion is wrapped with a shifter boot 27. There is.

Further, springs 28 and 29 are fitted into the sliding shaft 24 described above, and the base 2 of one spring 28 is inserted into the sliding shaft 24.
8a is supported inside the support member 23, and the support end 2
8b is locked to the locking protrusion 41 on the sliding shaft 24, the base 29a of the other spring 29 is supported inside the other support member 23', and the tip 29b is
two springs 28 and 2 that are engaged with the base 22b of the main transmission shifter 22 and that move the sliding shaft 24 above.
9 is biased with equal elastic force on the left and right sides.

On the other hand, a sliding shaft 24 that can pass through the support member 23
A main shift shifter arm 30 is fixed to the tip 24a of the main shift shifter arm 30, a main shift lever 31 is tightened and fixed to the tip of the main shift shifter arm 30 with a bolt 35, and the end of the main shift lever 31 is provided on the fender 32. A knob 34 is attached to the uppermost end by extending into the box 33 and bending the tip upward.

The main transmission box 33 mentioned above is the main transmission box 33 for tractor A.
It is fixed to the inclined upper surface of the left fender 32 that surrounds the upper surface of the rear wheel 11, and a long groove 36 is opened in the upper surface part, and in the middle of this long groove 36, there is a gear for positioning the gear change direction such as low speed, high speed, backward, etc. A locking hole (not shown) is provided, and a long groove long enough for the main shift lever 31 to move is also provided in the side wall 33a. still,
In the figure, 37 and 38 are connection shafts, which connect the main transmission shifter 2.
2 is transferred to the operating shaft 25, and this connecting shaft 3
7 and 38, the transmission inside the transmission case 8 is
It is formed to switch a direction changing gear (not shown), and 39 is a steering handle.

The embodiment of this invention is constructed as described above, in which the main shift lever 31 and the main shift shifter arm 30 are mounted at the end of the sliding shaft 24 that passes through the support members 23, 23' that protrude from the shifter guide 18. Since it is firmly fixed, the gear changeover operation can be performed smoothly.

That is, in FIG. 2, when the knob 34 attached to the top of the main gear shift lever 31 is in the solid line position, it is neutral, and the main gear shifter 22 is in the solid line position. Therefore, as shown in FIG. 3, when the knob 34 of the main shift lever 31 is rotated up and down in the direction of the arrow, the main shift lever 31 is rotated using the support member 23 supported and fixed to the upper part of the transmission case 8 as a bearing. For rotation, the main shift shifter arm 30 connected to the rear of the main shift lever 31 and the sliding shaft 24 integrally connected to the arm 30 are rotated to rotate the main shift shifter 22. At this time, in order to lock the main shift lever 31 at the desired shift position, the main shift lever 31 is pushed into the knobs 34' and 34'' shown in phantom lines, respectively, as shown in FIG. 2, and the long groove 36 is locked. The main speed change lever 31 is partially engaged in the hole to allow the tractor A to travel at a required speed.

With the configuration described above, the present invention has the following effects.

In this invention, the sliding shaft to which the main transmission shift is integrally attached and the shift guide that supports the sliding shaft are
In addition to being interposed between the seat and the transmission case, the main gear shift lever that operates the main gear shift is extended to the side of the seat, making effective use of the space around the seat, and the knob is connected to the end of the extension. With this configuration, the main shift lever mechanism can be installed in a minimum installation space, and the operability of the main shift lever mechanism by the operator can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a side view of a tractor showing an embodiment of the present invention, FIG. 2 is an assembled partially sectional view showing the essential parts of the present invention, and FIG. 3 is a side view of the same. 8: Mission case, 15: Seat bracket, 18: Shifter guide, 22: Main transmission shifter,
23, 23': Support member, 24: Sliding shaft, 27:
Shifter boots, 28, 29: Spring, 30:
Main gearshift shifter arm, 31: Main gearshift lever, 3
2: Fender, 33: Main transmission box, 34: Knob, A: Tractor.

Claims (1)

[Scope of utility model registration request] The seat 17 is arranged on the mission case 8 installed in the rear part B of the aircraft, and the mission case 8 and the seat 1
A shifter guide 18 is interposed between the transmission case 7 and the transmission case 8, and the shifter guide 18 is provided protruding from the upper surface of the transmission case 8, and a sliding shaft 24 with a main transmission shifter 22 mounted in the center thereof is attached to the shifter guide 18. A main shift lever 31 is attached to one end of the sliding shaft 24 via a main shift shifter arm 30.
the main gear shift lever 31 is extended to the side of the seat 17 along the fender 32 of the rear wheel 11,
A support structure for a main shift lever in a tractor, characterized in that a knob 34 is attached to an extending end of the main shift lever 31.